Controller for electric hoists.



N9. 732,619 PATENTED JUNE 30, 1903,

P. J. DARL I'NGTON. CONTROLLER FOR ELECTRIC HOISTS.

APPLICATION FILED 001. 3, 1902. no HQDBL. 2 SHEETS-SHEET 1.-

WITNE8SE$ INVENTOR "No. 732,619. BATENTED JUNE 30L 1903 P. J. DARLINGTOM CONTROLLER P011 ELECTRIC HOISTS. APPLICATION FILED OCT. 3, 1902. I no MODEL. 2 SHBBTS4HEBT 2 mveu'ron m: NORRIS PETERS c0 Puofauma. WASHINGTON, n. c.

position either immediately UNITED STATES Patented June 30, 1903.

PATE T OFFICE.

PHILIP J. DARLINGTON, OF GLENRIDGE, NEW JERSEY, ASSIGNOR TO SPRAGUE ELECTRIC COMPANY, A CORPORATION OF NEW JERSEY.

CONTROLLER FOR ELECTRIC HOISTS.

SPECIFICATION forming part of Letters Patent No. 732,619, dated June 30, 1903.

Application filed October S, 1902- To all whom it may concern:

Be it known that I, PHILIP J. DARLINGTON, of Glenridge, Essex county, New Jersey, have invented a new and useful'Controller for Eleotric Hoists, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 shows in perspective a hoistingmotor provided with my controller. Fig. 2 shows the controller. Fig. 3 is a diagram View showing the controller contacts and circuits. Figs. 4 and 5 are diagram views showing the circuit in the different positions of the controller.

My invention is designed to provide for the controlling of electric hoisting-motors, such as are used on traveling cranes or on stationary hoists. When used on traveling'cranes, the crane consists of a bridge mounted on wheels on elevated supporting-rails and carrying a traveling truck or trolley on which the hoisting'motor is mounted. The bridge maybe substituted by a boom, in which case suitable provision should be made for bracing and supporting it, or the hoisting-motor maybe mounted on a stationary support without any traveling bridge or trolley.

The hoisting-motor which I employ is series wound and is adapted to rotate forward and backward, as desired, for hoisting and lowering the load. When used for hoisting, it will generally suffice to have a controller with only one forward position; but in lowering the load it is very desirable that the controller should be arranged so that with heavy loads the descent shall not be too rapid and that the motor shall not be caused by the load to run away. I have devised for this purpose an efficient controller in which there are four positions-an off or open-circuit position to bring the motor to rest, a hoisting position, and two lowering positions, one of which provides for fast running, while the other provides for slow running by shunting the armature of the motor with a resistance in the shunt. In lowering a heavy load the operator moves the controller to the fourth or after it has been for a time in the third position, and in this way the motor is caused to run slowly Serial No.125.'769.

(No model.)

and too-rapid lowering is prevented. I also combine the controller with a brake, which when the controller is in off position is automatically applied to the motor and stops it.

In the drawings, 2 is the hoisting-drum, 3 is the hoisting-motor, 4 is the rotary shaft on which the controller-cylinder is fixed, and 5 is a lever from which depend ropes 6 6, by

which the controller may be rocked in either direction. The end portion of the shaft 4 is flattened, so as to afford cam-surfaces for releasing the brake, the arms 8 8 of which are engaged and spread by these surfaces when the controller is moved in either direction away from its oif position. When the controller is in olf position, these cam-surfaces permit a spring 9 to draw the brake-arms together upon a drum 10 on the motor-shaft and to stop the motor.

As shown in Figs. 2 and 3, the controllercylinder is of cylinder type and has contacts 11 11 11 11 and 13 .13 13 13 for hoisting and lowering positions, respectively, adapted to engage stationary contact-fingers 12 12 12 12 when the cylinder is thrown forward or back from its middle or ofi position. 13 is an extra contact on the row of loweringcont-acts adapted to engage a stationary contact-finger 12 when the cylinder is moved to its extreme position in lowering. These contacts are shown in diagram in Fig. 3.

When the controller is moved to hoisting position to hoist a load, the brake is released automatically, and the contacts 11 11 make contact with the fingers 12 12. The current 'then flows from the line L through contacts 12 11 11 12, armature A, contacts 12 11 11 12, field F to line L, and full speed in a direction proper for hoisting is effected.

To stop the motor, the controller is turned so that the contacts 12 12 are in their open or olf position, when all contacts are separated, the current is cut 01f from the motor, and the brake is applied automatically by the spring.

When it is desired to lower the load, the cylinder is rotated so as to bring the contacts 13 13 into engagement with the contacts 12 12, in which case the current flows from the line L through contacts 12 13 13 12, armature A, contacts 12 13 13 12, field F to line L. This moves the motor backward at full speed, as desired in lowering light loads or in starting to lower heavier loads.

If it is desired to lower slowly, the controller-cylinder is moved to its extreme position, in which the contacts 12 12 and 13 13 are left in engagement, and the extra contacts 12 and 13 are also brought into engagement. In this case a branch circuit is established around the armature from line L, contacts 12 13 13 12, resistance R, contacts 12 13 13 12, field I toline L. This causes additional current to flow through the series field, and thus causes the motor to operate at a slower speed.

In Fig. 4 I show in diagram the relation of the circuits when the controller is in the po sition forfull speed in lowering, and in Fig. 5 I show the circuits when the controller is in position for slow running in lowering the load.

It will thus be seen that for the lowering movement of the motor there are two operative positions. The preferred arrangement which is shown in the drawings is such that the first lowering position operates the motor at its fastest speed and the extreme lowering position operates it at a lower speed; but this arrangement may be reversed, so that the first lowering position will be that of slow speed and the extreme position that of the faster speed. In such case the operator will correspondingly change the manipulation of the controller.

Within the scope of my invention as defined in the claims the parts of the apparatus may be varied, since 1 claim- 1. In combination with a series wound hoisting-motor,areversingcylinder-controller having a contact adapted to shunt the armature of the motorin downward running; substantially as described.

2. In combination with a series wound hoisting-motor,areversingcylinder-controller having a contact adapted to shunt the armature of the motor with a resistance in downward running; substantially as described.

3. In combination with a series wound hoistin g-motor,a reversing cylinder-controller having contacts adapted for hoisting and lowering running respectively, and an extra contact adapted to shunt the armature and to cause slower running in lowering; substantially as described.

4. In combination with a series-wound motor, a controller of cylinder type arranged to operate the motor in either direction at a given speed and in one direction at a slower speed; substantially as described.

5. In combination with a series wound hoisting-motor,a reversing cylinder-controller having contacts adapted for hoisting and lowering running respectively, and an extra contact adapted on progressive movement of the controller in one direction to cause the motor to operate first at fast speed and then at slower speed by shunting the armature with a resistance; substantially as described.

6. The combination in a motor-driven hoist of a reversing-controller of cylinder type arranged to operate the motor at one speed only in hoisting and at two speeds in lowering; substantially as described. 7

7. The combination in a hoist driven by a series-wound motor of a reversing-controller having contacts adapted to operate the motor for hoisting and lowering without any external resistance, and an additional contact for shunting the armature with a resistance in lowering; substantially as described.

8. The combination with a hoist of a motor for operating the same, and a man uallyoperated reversing-controller for the motor, said controller having contacts affording two running positions for the lowering movement, the first position being adapted to afford a relatively rapid speed to the motor, and the second position to afford a slower speed; substantially as described.

In testimony whereof I have hereunto set my hand.

P. J. DARLINGTON.

Witnesses:

PAUL MULLER, JNo. J. F. CoNRoY. 

